mcdonald



2 Sheets-Sheet 1.-

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G. MQDONALD.

GGMPOUND- METAL WORKING MAGHIXE. No. 288,827. Patented Nov. 20, 1883'.

ATTORNEYS.

N. PETERS PhaN-LiflwmFMr. Wahmglon. B11.

(No ModeL) v "2 Sheets-Sheet 2. G. MGDONALD.

COMPOUND METAL WORKING MACHINE. No 288,827. ?tefitefi Nov. 20, '1883'.

WITNESSES: -IEvENTOE: E

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UNITED STATES PATENT FFICE.

GILBERT MCDONALD, OF GEORGETOWN, TERRITORY OF NEXV MEXICO, ASSIGNOR TO HIMSELF AXD JAMES A. LUCAS, OF SAME PLACE.

COMPOUND METAL-WORKING MACHINE.

vS1,FJIIIFIGAEION forming part of Letters Patent No. 288,827, dated November 20, 1883,

' Application filed May 23, 1893. (No model.)

To aZZ whom it may concern:

Be it known that I, GILBERT :MODONALD, of Georgetown, in the county of Grant and Territory of New Mexico, have invented certain new and useful Improvements in Metal Punches and Shears, of which the following is a full, clear, and exact description.

The object of my invention is to provide an improved construction and combination of devices in a. metal punch or shears, which shall make such machines work more easily and effectively on hot or cold metals, and with a minimum of applied force or power.

a Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar letters of reference indicate corresponding parts in all the figures.

Figure 1 represents my improved punch in front elevation. Fig. 2 is a longitudinal vertical section of the same. Fig. 3 is a front elevation of a shears embodying my improvements in a tool of a portable character; and Fig. 4 is a longitudinal sectional elevation of the same on line a; a, Fig. 3, showing also a detail view of aplate, as, hereinafter described.

First describing the improvements as applied to the metal-punch of Figs. 1 and 2, a represents any suitable standard having a base, I), for securing the machine to the floor or a bench or post. The plate 0, which supports the working parts of the 1nachine,,is firmly screwed or bolted to the face of standard a, and this plate 0 may have side plates or cheek-pieces, c, for embracing the sides of the standard and bolting thereto for better support of the tool, if desired. In this instance I have formed a projection or boss, 0 on plate c, and on which I pivot strongly at (Z the arm or lever e, which is fitted with a stout pivot-pin, c, which is set eccentrically to the pivot d, as shown, said pin 6' carrying by an eye or loop the connecting or thrust bar f of the punch 91, which is fitted to reciprocate in ways k, secured suitably to the standard a, which also carries any approved form of anvil or die-block, for supporting the work, the standard a being preferably recessed at a for entrance of work to be punched at a distance from its edge. Abridge-piece,cflorlever eholds the thrust-barf on the pivot-pin c, and asuitable cap-plate, j, is passed sidewise into notches of the side plates, 3', of the ways h, which plate j may be locked by any suitable device to the plates j, and serves to prevent displacement of the link-piece 7;, which connects the thrustbar f and punch g by pins 7: entering apertures of the bar and punch, so as readily to remove one tool and replace another, the tools being lifted by the pins 7;, which have sufficient looseness to permit the stress of the work on the downstroke to be taken by the concaved head of the tool and the convcxed foot of the thrust bar, which rocks freely on the tool, as will be understood from Fig. 1. The cap j may be fastened to the ways it by a pin and lever contrivance, (dotted in Fig. 1,) or any suitable lock-catch may be employed for the purpose.

For operating the lever c audits eccentricpin 6 for working the punch, lemploy a main lever, Z, pivoted strongly at Z to a bearing on standard a or plate a, to which lever Z is rigidly fitted a bridge-piece, P, which has pivoted to it at m the link on, through the loop or slot of which the head or free end of lever 6 passes, said lever having a hook or stop, 6 to prevent accidental disconnection of the link therefrom. The link m carries an anti-friction roller, n, to roll upon one side or edge of lever ewhile lift ing the punch, and a like roller, 0, working freely at the free end of the link for traveling over the face or edge e" of lever e, for relieving the excessive friction on the working or down stroke of the punch. The roller a may be used or not, as desired. On the upstroke of main lever 1 (limited by a stop, 0) the lever 6 will move up on its pivot (Z and carry the eccentric-pin c with it for lifting the punch to the position of Fig. 1; and on the downstroke of main lever Z the link-roller 0 will travel over face 6* of lever c, swinging the latter and its eccentric-pin c downward for forcing the punch gradually through the hot or cold metal on the block 93. It will be noticed that in the punching action the power of the eccentric-connection 6 of lever c is utilized and aided by the gradually-increasing leverage afforded by the travel of roller 0 toward the outer end of lever e, which combined functions greatly increase the useful capacities of the machine, especially in punching steel plates or bars.

Figs. 3 and 4. represent my improvements applied to a shears adapted to be worked by hand, and to be portable for use about carriages and wagons, and in shops for shearing off bolts, rods, or small plates of metal or wood. The main bar of the shears being the equiva lent of the plate of Figs. 1 and 2, I give it a similar reference-letter, and to this shear-bar 0 of Figs. 3 and 4 I connect the levers e Z, link and roller m 0, and thrust-bar f, in substantially similar arrangement to that of Figs. 1 and 2, and I connect the thrust-bar by the link piece with the reciprocating shear-blade T, which works against the stationary blade or cutter s, fitted by a pin and socket or other connection with the head t of the tool, suitably to resist the thrust of blade 0*, and to be re moved easily for sharpening or renewal. The action of the link-connected levers and eccentric is the same in both shears and punch, as are also the advantages in the application and economy of power. One end of both bar 0 and leverl of the shears is rounded and shaped suitably for handles to work the cutter r and direct the tool-cutters to any point desired; and as the shear-cutters are to be worked in varied positions of the tool, it is desirable that the capplate u for confining the reciprocating cutter r and link 70 should be fitted to the guideways h by a firm lock, which I provide by headed undercut studs 11, fixed in the ways 71, and over which the slots to of plate a may be passed, and the plate then slid beneath the heads of studs 1), and locked in this position by a cam-plate, w, pivoted on plate u in a manner to permit swinging its eccentric face by a knob, w, against one or both of the contiguous studs 1), as shown, which will effectively lock the plate a to the tool; and to make the lock more SIGUIG a pawl, a pivoted on plate a is engaged with a notch of the eccentric-plate w, to prevent backward loosening movement of the plate 11).

For a simple means of holding the pivot-pin at to the thin metal bodies of the parts 0 e, I shall fiX the pin rigidly in lever e, and to work freely in bar 0, to which bar I confine the pin by a plate, as, having an elongated slot to be passed over the end of pin (Z, and then drawn to engage the edge at the slot with a groove of the pin, whereupon the plate 00 will be fastened firmly to bars by a rivet or screw, 00

Thus arranged, it is believed that mypunch and shears have material advantages over such machines as commonly constructed, and that in working them a saving of both power and time will be effected.

My improved compound lever and eccentric devices are not restricted in use to work the tools of punching and shearing machines. but will be applicable as well to other machines or devices requiring heavy lifts or compression at a comparatively small outlay of power.

Having thus described my invention, I claim as new and desire to secure by Letters Patent- 1. The combination, with a punch thrustbar having pivot d, of an arm, a, carrying a pivot, e, eccentric to pivot d, having an eye loop and provided with a bridge-piece, e as and for the purpose described.

2. The combination, with the lever Z, of a loop-linkm, a bridge-piece, 6 and an arm, 0, having end projection 0 as and for the purpose specified.

3. The combination of lever e, eecentriepin e, thrustbar f, lever Z, and link m, carrying roller 0, and with or without roller a, substantially as shown and described.

4. The combination, with the tool thrustbarf, guides h for the tool, and the loose connecting-link k, of the confining-plate a, slot ted at u, the undercut studs vin guides h, and the eccentric-plate w, pivoted on plate a to lock against the studs 1), substantially as shown and described.

5. The combination, with the slotted plate a, undercut studs 09, and eccentric-plate w, of the pawl 20 engaging plate 20, substantially as shown and described.

6. The combination, with the bar 0 and pivot d, of the slotted plate :10, substantially as shown and described.

GILBERT MCDONALD.

Vitnesses:

NAT. KENNEDY, S. D. MARTIN. 

